# README

- **Author(s):** Thomas Bawin
- **Generated on:** 2025-04-28 (YYYY-MM-DD)  
- **Last updated:** 2025-05-12  

---

# General Information

- **Dataset Title:** NIVA_FC_SIMPLAST_01  
- **Contributors:** 
   - France Collard: Plastic preparation
   - Thomas Bawin: Imaging  
- **Contact Information (PI):** 
  - **Name:** France Collard  
  - **Institution:** NIVA  
  - **Email:** france.collard@niva.no  
- **Data Type:** Hyperspectral image data (VNIR, 400–1000 nm; SWIR, 900–1700 nm)  
- **Data Collection:** Thomas Bawin  
- **Date of Collection:** 2025-04-28 & 2025-05-12
- **Data Processing:** Thomas Bawin 
- **Date of Processing:** 2025-05-07 & 2025-05-12  
- **Geographic Location:** Climate Laboratory Holt, UiT The Arctic University of Norway  
- **Dataset Description:**  
Virgin plastic pellets and environmental plastics were imaged on 90 mm glass fiber (GF/F) filter paper (Whatman 1825-090).  
PE = polyethylene (Cospheric, Product ID CPMS-0.96);  
LDPE = low-density polyethylene (Hawai'i Pacific, Polymer Kit 1.0);  
PP = polypropylene (Hawai'i Pacific, Polymer Kit 1.0);  
PET = polyethylene terephthalate (Hawai'i Pacific, Polymer Kit 1.0);  
TWP (CR) = tire wear particle (Hawai'i Pacific, Polymer Kit 1.0).  
Plastic classes were labeled as `[Polymer]_[Condition]_[Size-range]`.  
Inox plate and Teflon (PTFE) backgrounds were used instead of GF/F where specified in the filename.  

---

# Methodological Information

- **Data Collection:**
Data collection was performed in a dark room using Specim FX10e (VNIR, 400–1000 nm) and FX17e (SWIR, 900–1700 nm) hyperspectral cameras mounted side-by-side in dual imaging mode within a Specim Labscanner 100x50. The cameras were each connected to a dedicated Windows 11 computer (version 22H2) and operated simultaneously. Data for each camera were recorded on their respective computer with the Lumo Scanner 2020.18 (FX10e) and Lumo Recorder 2020.23 (FX17e) acquisition software under eBUS SDK 5.1.10.4642. No spectral or spatial binning was applied. A near-perfect aspect ratio was achieved at a frame rate of 70 Hz and 43.75 Hz for the FX10e and FX17e cameras, with a scanning speed of 14.20 mm/s and an approximate working distance of 29 cm and 28 cm. Exposure time was set to 3.7 ms and 2 ms, with the lower edge of the two lighting units at 15 cm from the samples, and the five centermost halogen bulbs (41866 WFL, 12V, 35W, 36°, 430 lm, 2900K, GU5.3, FS1, Osram, Germany) of each lighting unit turned on. For each image, the workflow consisted of:
  - Taking dark references for both cameras by closing the shutters.
  - Taking white references for both cameras after moving to the reference positions.
  - Recording the target area from the FX10e start position to the FX17e stop position.


- **Data Processing:**  
Corrected image cubes were generated automatically (FX10e) or manually (FX17e) using a plugin ("Reflectance" in Lumo Scanner and "Normalise dataset without camera" in Lumo Recorder). SHA-256 checksums were created and appended to each image folder before being archived in a compressed (.tar.gz) format.  

---

# Data & File Overview

- **File Description:**  
The dataset includes image cubes from both cameras - one folder per image cube. Image folders and data files are named using a prefix_identifier_timestamp structure. Each cube is encoded as a Band Interleaved by Line (BIL) image file (with a generic .dat extension). Each image folder contains:  
  - A raw sample image cube from either FX10e or FX17e.  
  - Corresponding "WHITE_" and "DARK_" reference cubes for reflectance correction.  
  - A corrected "REFLECTANCE_" sample image cube.  
  - ENVI-formatted header files (.hdr), one for each cube.  
  - A "manifest.xml" file summarizing the folder content.  
  - SHA-256 checksums for all files in the folder.  


- **Relationships Between Files:**  
  - Corrected image cubes are derived from raw cubes using their corresponding white and dark reference files.  
  - FX10e and FX17e image cubes with the same identifier and timestamp result from the same recording.  


- **File List:**  
```
NIVA_FC_SIMPLAST_01/Specim/
|-- FX10e
|   |-- fx10e_GF-F_2025-05-12_11-15-54.tar.gz
|   |-- fx10e_LDPE1-2_Virgin_5000_2025-04-28_12-43-21.tar.gz
|   |-- fx10e_LDPE1_Virgin_5000_2025-04-28_12-35-48.tar.gz
|   |-- fx10e_LDPE1_Virgin_5000_Inox_2025-04-29_07-36-26.tar.gz
|   |-- fx10e_LDPE1_Virgin_5000_PTFE_2025-04-29_07-30-14.tar.gz
|   |-- fx10e_LDPE2_Virgin_5000_2025-04-28_12-49-33.tar.gz
|   |-- fx10e_PET1_Virgin_5000_2025-04-28_13-33-44.tar.gz
|   |-- fx10e_PE_Env_1_2025-04-30_12-59-17.tar.gz
|   |-- fx10e_PE_Env_2_2025-04-30_13-05-27.tar.gz
|   |-- fx10e_PE_Virgin_125-150_2025-04-30_13-30-36.tar.gz
|   |-- fx10e_PE_Virgin_425-500_2025-04-30_13-22-35.tar.gz
|   |-- fx10e_PE_Virgin_850-1000_2025-04-28_11-46-44.tar.gz
|   |-- fx10e_PE_Virgin_850-1000_2025-04-28_12-02-55.tar.gz
|   |-- fx10e_PE_Virgin_850-1000_2025-04-28_12-24-08.tar.gz
|   |-- fx10e_PE_Virgin_850-1000_Inox_2025-04-29_07-40-45.tar.gz
|   |-- fx10e_PE_Virgin_850-1000_PTFE_2025-04-29_07-21-53.tar.gz
|   |-- fx10e_PP_Env_1_2025-04-30_13-10-43.tar.gz
|   |-- fx10e_PP_Env_2_2025-04-30_13-15-13.tar.gz
|   |-- fx10e_PP_Virgin_125-500_2025-04-30_13-37-20.tar.gz
|   |-- fx10e_PP_Virgin_5000_2025-04-28_13-24-57.tar.gz
|   |-- fx10e_TWP_Virgin_1000-5000_2025-04-28_13-43-10.tar.gz
|   `-- sha256.txt
|-- FX17e
|   |-- fx17e_GF-F_2025-05-12_11-15-54.tar.gz
|   |-- fx17e_LDPE1-2_Virgin_5000_2025-04-28_12-43-21.tar.gz
|   |-- fx17e_LDPE1_Virgin_5000_2025-04-28_12-35-48.tar.gz
|   |-- fx17e_LDPE1_Virgin_5000_Inox_2025-04-29_07-36-26.tar.gz
|   |-- fx17e_LDPE1_Virgin_5000_PTFE_2025-04-29_07-30-14.tar.gz
|   |-- fx17e_LDPE2_Virgin_5000_2025-04-28_12-49-33.tar.gz
|   |-- fx17e_PET1_Virgin_5000_2025-04-28_13-33-44.tar.gz
|   |-- fx17e_PE_Env_1_2025-04-30_12-59-17.tar.gz
|   |-- fx17e_PE_Env_2_2025-04-30_13-05-27.tar.gz
|   |-- fx17e_PE_Virgin_125-150_2025-04-30_13-30-36.tar.gz
|   |-- fx17e_PE_Virgin_425-500_2025-04-30_13-22-35.tar.gz
|   |-- fx17e_PE_Virgin_850-1000_2025-04-28_11-46-44.tar.gz
|   |-- fx17e_PE_Virgin_850-1000_2025-04-28_12-02-55.tar.gz
|   |-- fx17e_PE_Virgin_850-1000_2025-04-28_12-24-08.tar.gz
|   |-- fx17e_PE_Virgin_850-1000_Inox_2025-04-29_07-40-45.tar.gz
|   |-- fx17e_PE_Virgin_850-1000_PTFE_2025-04-29_07-21-53.tar.gz
|   |-- fx17e_PP_Env_1_2025-04-30_13-10-43.tar.gz
|   |-- fx17e_PP_Env_2_2025-04-30_13-15-13.tar.gz
|   |-- fx17e_PP_Virgin_125-500_2025-04-30_13-37-20.tar.gz
|   |-- fx17e_PP_Virgin_5000_2025-04-28_13-24-57.tar.gz
|   |-- fx17e_TWP_Virgin_1000-5000_2025-04-28_13-43-10.tar.gz
|   `-- sha256.txt
`-- README.md

2 directories, 45 files
```

Structure obtained with `tree -L 3 --charset=ANSI NIVA_FC_SIMPLAST_01/Specim/`.  

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